镇定自若

The managing director's calm words dispelled the clerks' fears of being cut down.

董事长那镇定自若的话消除了员工们被裁减的忧。

Fearless and unworried at all times, whether dealing with religious debate, a patricidal prince, or a murderous outlaw.

面对着宗教争论，一个杀父的王子或者一个杀的歹徒，他都一直都是无畏和镇定自若。